nnThe capitalize() method is a built-in Python string method that is accessible in Jinja2 templates. It returns a copy of a string with its first character capitalized and the rest of the characters in lowercase. This is useful for formatting text for display, such as titles or names, to ensure consistent capitalization.nn

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How It Works

ncapitalize() is a filter in Jinja2, which means you apply it to a variable or expression using the pipe (|) operator. Jinja2’s capitalize filter is a direct wrapper around Python’s str.capitalize() method.n

Syntax

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{{ some_string | capitalize }}

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• Input: A string.

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• Output: A new string where the first character is uppercase, and all subsequent characters are lowercase.

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Demonstration with Code Samples

nHere are some practical examples of how to use the capitalize() method in a Jinja2 application.n

1. Formatting a Single String

nThis is the most common use case, where you want to ensure a single variable is displayed with correct capitalization.nnJinja2 Templaten

{% set page_title = "about us" %}n<p>Page Title: {{ page_title | capitalize }}</p>nn{% set user_name = "john DOE" %}n<p>Welcome, {{ user_name | capitalize }}!</p>

nExplanation: The page_title variable, “about us”, becomes “About us”. The user_nn